body {
    width: 100%;
    height: auto;
}

.welcome {
    background-color: rgba(0, 0, 0, 0.1);
    border: none;
    height: 90%;
    position: relative;
}

.welcome .tit {
    box-sizing: border-box;
    position: relative;
    width: 800px;
    height: 100px;
    line-height: 100px;
    box-shadow: inset 0 0 0 1px white;
    margin: 40px auto;
    margin-top: 40px;
    color: white;
    text-align: center;
    font-size: 50px;
    font-weight: normal;
    letter-spacing: 10px;
}

.welcome .tit .border {
    width: 812px;
    height: 112px;
    position: absolute;
    top: -6px;
    left: -6px;
    border: 3px solid white;
    box-sizing: border-box;
    animation: clipMe 5s linear infinite;
}

.welcome .intro {
    letter-spacing: 5px;
    line-height: 50px;
    width: 80%;
    margin: 0 auto;
    text-align: center;
    font-weight: normal;
    color: white;
}

.down {
    animation: bounce 2s infinite;
    animation-duration: 3s;
    font-size: 20px;
    background-image: linear-gradient(#f0efd0,#00a8c6);
    position: absolute;
    /*bottom: 5px;*/ right: 5px;
    left: 90%;
    transform: translateX(-50%);
    display: flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 2px solid #fff;
}

.down:hover {
    animation: none;
    cursor: pointer;
    box-shadow: 0 0 20px 0 white;
    transition: all .2s;
}

@keyframes clipMe {

    0%,
    100% {
        clip: rect(0px, 806px, 6px, 0px);
    }

    25% {
        clip: rect(0px, 6px, 112px, 0px);
    }

    50% {
        clip: rect(112px, 812px, 112px, 0px);
    }

    75% {
        clip: rect(0px, 812px, 112px, 806px);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translate(-50%, 0);
    }
    40% {
        transform: translate(-50%, -30px);
    }
    60% {
        transform: translate(-50%, -15px);
    }
}